--- /dev/null
+/*
+ * Copyright (C) 1994, Index Data I/S
+ * All rights reserved.
+ * Sebastian Hammer, Adam Dickmeiss
+ *
+ * $Log: mfile.c,v $
+ * Revision 1.1 1994-08-23 14:41:33 quinn
+ * First functional version.
+ *
+ */
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include <util.h>
+#include <mfile.h>
+
+static MFile_area_struct *open_areas = 0;
+static MFile_area_struct *default_area = 0;
+
+static int scan_areadef(MFile_area ma, const char *name)
+{
+ const char *ad = res_get(common_resource, name);
+ int offset = 0, rs, size, multi, rd;
+ char dirname[FILENAME_MAX+1], unit;
+ mf_dir **dp = &ma->dirs, *dir = *dp;
+
+ if (!ad)
+ {
+ log(LOG_FATAL, "Could not find resource '%s'", name);
+ return -1;
+ }
+ for (;;)
+ {
+ rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
+ if (rs <= 1)
+ break;
+ if (rs != 3)
+ {
+ log(LOG_FATAL, "Illegal directory description: %s", ad + offset);
+ return -1;
+ }
+ switch (unit)
+ {
+ case 'B': case 'b': multi = 1; break;
+ case 'K': case 'k': multi = 1024; break;
+ case 'M': case 'm': multi = 1048576; break;
+ default:
+ log(LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
+ return -1;
+ }
+ *dp = dir = xmalloc(sizeof(mf_dir));
+ dir->next = 0;
+ strcpy(dir->name, dirname);
+ dir->max_bytes = dir->avail_bytes = size * multi;
+ dp = &dir->next;
+ offset += rd;
+ }
+ return 0;
+}
+
+static int file_position(MFile mf, int pos)
+{
+ int off = 0, c = mf->cur_file, ps;
+
+ if ((c > 0 && pos <= mf->files[c-1].top) ||
+ (c < mf->no_files -1 && pos > mf->files[c].top))
+ {
+ c = 0;
+ while (mf->files[c].top >= 0 && mf->files[c].top < pos)
+ {
+ off += mf->files[c].blocks;
+ c++;
+ }
+ assert(c < mf->no_files);
+ }
+ else
+ off = c ? (mf->files[c-1].top + 1) : 0;
+ if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
+ mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
+ {
+ log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
+ return -1;
+ }
+ if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize, SEEK_SET) < 0)
+ {
+ log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
+ return -1;
+ }
+ mf->cur_file = c;
+ return ps;
+}
+
+static int cmp_part_file(const void *p1, const void *p2)
+{
+ return ((part_file *)p1)->number - ((part_file *)p2)->number;
+}
+
+/*
+ * Create a new area, cotaining metafiles in directories.
+ * Find the part-files in each directory, and inventory the existing metafiles.
+ */
+MFile_area mf_init(const char *name)
+{
+ MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
+ mf_dir *dirp;
+ meta_file *meta_f;
+ part_file *part_f;
+ DIR *dd;
+ struct dirent *dent;
+ int fd, number;
+ char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
+
+ for (mp = open_areas; mp; mp = mp->next)
+ if (!strcmp(name, mp->name))
+ abort();
+ strcpy(ma->name, name);
+ ma->next = open_areas;
+ open_areas = ma;
+ ma->mfiles = 0;
+ ma->dirs = 0;
+ if (scan_areadef(ma, name) < 0)
+ {
+ log(LOG_FATAL, "Failed to access description of '%s'", name);
+ return 0;
+ }
+ /* look at each directory */
+ for (dirp = ma->dirs; dirp; dirp = dirp->next)
+ {
+ if (!(dd = opendir(dirp->name)))
+ {
+ log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
+ return 0;
+ }
+ /* look at each file */
+ while ((dent = readdir(dd)))
+ {
+ if (*dent->d_name == '.')
+ continue;
+ if (sscanf(dent->d_name, "%[^.].%d", metaname, &number) != 2)
+ {
+ log(LOG_FATAL, "Failed to resolve part-name %s", dent->d_name);
+ return 0;
+ }
+ for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
+ {
+ /* known metafile */
+ if (!strcmp(meta_f->name, metaname))
+ {
+ part_f = &meta_f->files[meta_f->no_files++];
+ break;
+ }
+ }
+ /* new metafile */
+ if (!meta_f)
+ {
+ meta_f = xmalloc(sizeof(*meta_f));
+ meta_f->ma = ma;
+ meta_f->next = ma->mfiles;
+ meta_f->open = 0;
+ meta_f->cur_file = -1;
+ ma->mfiles = meta_f;
+ strcpy(meta_f->name, metaname);
+ part_f = &meta_f->files[0];
+ meta_f->no_files = 1;
+ }
+ part_f->number = number;
+ part_f->dir = dirp;
+ part_f->fd = -1;
+ sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
+ part_f->path = xstrdup(tmpnam);
+ /* get size */
+ if ((fd = open(part_f->path, O_RDONLY)) < 0)
+ {
+ log(LOG_FATAL|LOG_ERRNO, "Failed to access %s", dent->d_name);
+ return 0;
+ }
+ if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
+ {
+ log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", dent->d_name);
+ return 0;
+ }
+ close(fd);
+ dirp->avail_bytes -= part_f->bytes;
+ }
+ closedir(dd);
+ }
+ for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
+ {
+ log(LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
+ meta_f->no_files);
+ qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
+ cmp_part_file);
+ }
+ return ma;
+}
+
+/*
+ * Open a metafile.
+ * If !ma, Use MF_DEFAULT_AREA.
+ */
+MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
+{
+ struct meta_file *new;
+ int i;
+ char tmp[FILENAME_MAX+1];
+ mf_dir *dp;
+
+ if (!ma)
+ {
+ if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
+ {
+ log(LOG_FATAL, "Failed to open default area.");
+ return 0;
+ }
+ ma = default_area;
+ }
+ for (new = ma->mfiles; new; new = new->next)
+ if (!strcmp(name, new->name))
+ if (new->open)
+ abort();
+ else
+ break;
+ if (!new)
+ {
+ new = xmalloc(sizeof(*new));
+ strcpy(new->name, name);
+ /* allocate one, empty file */
+ new->no_files = 1;
+ new->files[0].bytes = new->files[0].blocks = 0;
+ new->files[0].top = -1;
+ new->files[0].number = 0;
+ new->files[0].fd = -1;
+ new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
+ for (dp = ma->dirs; dp && dp->avail_bytes < new->min_bytes_creat;
+ dp = dp->next);
+ if (!dp)
+ {
+ log(LOG_FATAL, "Insufficient space for new mfile.");
+ return 0;
+ }
+ new->files[0].dir = dp;
+ sprintf(tmp, "%s/%s.%d", dp->name, new->name, 0);
+ new->files[0].path = xstrdup(tmp);
+ new->ma = ma;
+ }
+ new->blocksize = block_size;
+ new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
+ new->wr=wflag;
+ new->cur_file = 0;
+
+ for (i = 0; i < new->no_files; i++)
+ {
+ new->files[i].blocks = new->files[i].bytes / new->blocksize;
+ if (i == new->no_files)
+ new->files[i].top = -1;
+ else
+ new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
+ : (new->files[i].blocks - 1);
+ }
+ return new;
+}
+
+/*
+ * Close a metafile.
+ */
+int mf_close(MFile mf)
+{
+ abort();
+ return 0;
+}
+
+/*
+ * Read one block from a metafile. Interface mirrors bfile.
+ */
+int mf_read(MFile mf, int no, int offset, int num, void *buf)
+{
+ if (file_position(mf, no) < 0)
+ exit(1);
+ if (read(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
+ {
+ log(LOG_FATAL|LOG_ERRNO, "Read failed");
+ exit(1);
+ }
+ return 0;
+}
+
+/*
+ * Write.
+ */
+int mf_write(MFile mf, int no, int offset, int num, const void *buf)
+{
+ int ps;
+ mf_dir *dp;
+ char tmp[FILENAME_MAX+1];
+
+ if ((ps = file_position(mf, no)) < 0)
+ exit(1);
+ assert(ps <= mf->files[mf->cur_file].blocks);
+ /* extend table */
+ if (ps == mf->files[mf->cur_file].blocks)
+ {
+ assert(mf->cur_file == mf->no_files - 1);
+ /* create new file */
+ if (mf->files[mf->cur_file].dir->avail_bytes <
+ mf->blocksize)
+ {
+ log(LOG_DEBUG, "Creating new file.");
+ for (dp = mf->ma->dirs; dp && dp->avail_bytes < mf->min_bytes_creat;
+ dp = dp->next);
+ if (!dp)
+ {
+ log(LOG_FATAL, "Cannot allocate more space for %s", mf->name);
+ exit(1);
+ }
+ mf->files[mf->cur_file].top = no - 1;
+ mf->files[++(mf->cur_file)].top = -1;
+ mf->files[mf->cur_file].dir = dp;
+ mf->files[mf->cur_file].number =
+ mf->files[mf->cur_file-1].number + 1;
+ mf->files[mf->cur_file].blocks =
+ mf->files[mf->cur_file].bytes = 0;
+ mf->files[mf->cur_file].fd = -1;
+ sprintf(tmp, "%s/%s.%d", dp->name, mf->name,
+ mf->files[mf->cur_file].number);
+ mf->files[mf->cur_file].path = xstrdup(tmp);
+ mf->no_files++;
+ /* open new file and position at beginning */
+ if (file_position(mf, no) < 0)
+ exit(1);
+ }
+ mf->files[mf->cur_file].blocks++;
+ mf->files[mf->cur_file].bytes += mf->blocksize;
+ mf->files[mf->cur_file].dir->avail_bytes -= mf->blocksize;
+ }
+ if (write(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
+ {
+ log(LOG_FATAL|LOG_ERRNO, "Write failed");
+ exit(1);
+ }
+ return 0;
+}
+
+/*
+ * Destroy a metafile, unlinking component files. File must be open.
+ */
+int mf_unlink(MFile mf)
+{
+ abort();
+ return 0;
+}
+
+/*
+ * Unlink the file by name, rather than MFile-handle. File should be closed.
+ */
+int mf_unlink_name(MFile_area ma, const char *name)
+{
+ abort();
+ return 0;
+}